<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      button {
        opacity: 0.99;
        transition: opacity 2s;
      }
      button:not(:disabled):active {
        opacity: 1;
        transition: 0s;
      }
    </style>
  </head>
  <body>
    <button>点我提示</button>
  </body>
</html>
<script>
  var btn = document.querySelector('button');
  btn.onclick = function () {
    alert('哈哈哈');
  };

  // 过渡开始
  document.addEventListener('transitionstart', function (ev) {
    ev.target.disabled = true;
  });
  // 过渡结束
  document.addEventListener('transitionend', function (ev) {
    ev.target.disabled = false;
  });
</script>
